As far as braking the arms on a 501 goes, here is a quote from the DEX410R review here at oOple.
"The suspension arms are (identical to the DEX410) moulded with plenty of glass or and are proven to be really tough - possibly too tough depending on your point of view since something else might well break instead of these arms. I bought some spare sets for the original car and never used them - it seems the Tamiya TRF501X finally has a match in the toughness stakes."
As I understand that quote, the 501 arms are (according to the writer) one of the toughest available, and before the DEX came possibly the toughest available.
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